Abstract
Morphology, tribological, and mechanical properties of polyamide 6/maleic anhydride grafted polypropylene (MAH-g-PP) blends were investigated. MAH-g-PP with various MAH ratios and controlled grafting degree were prepared by mixing appropriate amounts of PP, MAH-g-PP, and PP in a twin screw extruder. 10-30 wt% MAH-g-PP and PP were blended with PA 6 and were injection-molded into ASTM flexural and tensile test pieces. The morphological study of the blends was carried out by means of SEM. Tribological properties such as coefficient of friction and specific wear rate were measured by using a Pin-on-Disk type test apparatus at 28°C. Mechanical properties (tensile strength and inter laminar shear strength and their yield strains) were measured and then compared with tribological properties. The PP particle size in PA 6 matrix decreased with introduction of MAH into PP. The coefficient of friction increased slightly with PP particle size, but the specific wear rate decreased a little with it. Although coefficient of friction of PA 6/PP blends tended to decrease with MAH content, specific wear rate increased with MAH content. The comparison of tribological properties with mechanical properties among PA 6/PP blends clarified the effect and function of MAH on the tribological and mechanical properties.
